Sarcastically (and perhaps cynically) speaking, I don't think it's that big of a stretch to assume that the government would either not care about, or be too ineffective to properly take control of the discovery of D'ni
More seriously, I think that if anything, the fantastical nature of D'ni may very well put it on the fringes of scientific and social acceptability... it's just too impossible
to even possibly be true, and that may work to the advantage of the story, but I don't think it's an indefinite solution. For a while your journalistic reports might be relegated to Weekly World News
(next to "Bat-boy Spotted in New York Sewer Main"), but inevitably someone's going to use a Relto Book in a crowded mall, and then all hell will break loose
. In the meantime, though, I think all of the characters in Uru approach it in a manner similar to Magical Realism... to them, D'ni really isn't all that big of a deal, despite its enormous personal importance, while the rest of the world just looks at them (and the rest of the explorers, by extension) like they're crazy.